Which pioneering feature did Spotify introduce in 2015 that revolutionized personalized music discovery using machine learning?

The music industry has been transformed by streaming platforms that use sophisticated algorithms to personalize your listening experience. These recommendation engines analyze your habits, preferences, and even the acoustic properties of songs to suggest new music you might enjoy. Behind these seemingly magical recommendations lies complex machine learning systems working to understand your musical taste. Test your knowledge about how AI shapes your music discovery journey!

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Discover Weekly, which creates personalized playlists based on listening habits and similar users' preferences
Sound Search, which identifies songs by analyzing acoustic fingerprints when you hum a melody
Genre Explorer, which uses neural networks to create new fusion genres based on your top artists
Mood Match, which analyzes your phone's biometric data to suggest music matching your current emotional state